Rock oil, mineral oil, or natural oil, a dark brown or greenish inflammable liquid, which, at certain points, exists in the upper strata of the earth, from whence it is pumped, or forced by pressure of the gas attending it. It consists of a complex mixture of various hydrocarbons, largely of the methane series, but may vary much in appearance, composition, and properties. It is refined by distillation, and the products include kerosene, benzine, gasoline, paraffin, etc.
You hear entertainers all the time, saying, 'If I couldn't get paid for this, I'd do it for free.' When's the last time you ever heard a business person say, 'If I couldn't get paid for being chairman of British Petroleum, I'd do it for free'? Dick Gregory
Like the vast majority of my constituents, I continue to be concerned about record profits reported by petroleum companies at a time when consumers are paying record high prices for gasoline. Mike Rogers
The use of refined petroleum as fuel, which began in the 1850s, freed hundreds of millions of people from the toil of centuries, gave hundreds of millions more a life of ease and plenty, and, by allowing great cities to feed themselves from every corner of the world, multiplied the population of the earth fivefold. James Buchan